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Paisan Ruamviboonsuk; Khemawan Teerasuwanajak; Montip Tiensuwan; Kanokwan Yuttitham. (2006). Interobserver Agreement in the Interpretation of Single-Field Digital Fundus Images for Diabetic Retinopathy Screening. , 113(5), 0–832. doi:10.1016/j.ophtha.2005.11.021 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research